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          <h1 class="post-title" itemprop="name headline">分布式--NIO-Netty</h1>
        

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        <p>####1. <a href="http://netty.io/" target="_blank" rel="noopener">Netty</a><br>Netty是一个提供异步事件驱动的网络应用框架，用以快速开发高性能、高可靠性的网络服务器和客户端程序。换句话说，Netty是一个NIO框架，使用它可以简单快速地开发网络应用程序，比如客户端和服务端的协议。Netty大大简化了网络程序的开发过程比如TCP和UDP的 Socket的开发。快速和简单”并不意味着应用程序会有难维护和性能低的问题，Netty是一个精心设计的框架，它从许多协议的实现中吸收了很多的经验比如FTP、SMTP、HTTP、许多二进制和基于文本的传统协议，Netty在不降低开发效率、性能、稳定性、灵活性情况下，成功地找到了解决方案。<br><a href="http://netty.io/downloads.html" target="_blank" rel="noopener">Netty下载</a>，建议不要下载最新的包。<br><a href="http://ifeve.com/category/netty/" target="_blank" rel="noopener">Netty学习</a><br><a href="https://github.com/ReactivePlatform/netty-in-action-cn" target="_blank" rel="noopener">Netty In Action 中文版</a><br><a id="more"></a></p>
<p>####2. 入门–DISCARD(丢弃服务，指的是会忽略所有接收的数据的一种协议)</p>
<p>######1). 创建DiscardServerHandler继承自ChannelInboundHandlerAdapter<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 忽略所有消息--继承ChannelHandlerAdapter</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class DiscardServerHandler extends ChannelInboundHandlerAdapter &#123;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception &#123;</span><br><span class="line">		// 释放</span><br><span class="line">		ReferenceCountUtil.release(msg);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception &#123;</span><br><span class="line">		// 打印错误信息</span><br><span class="line">		cause.printStackTrace();</span><br><span class="line">		// 关闭</span><br><span class="line">		ctx.close();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######2). 创建忽略服务器消息的服务器<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 忽略消息的服务器</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class DiscardServer &#123;</span><br><span class="line">	/**端口*/</span><br><span class="line">	private int port;</span><br><span class="line">	</span><br><span class="line">	public DiscardServer(int port) &#123;</span><br><span class="line">		this.port = port;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	public void run() throws Exception&#123;</span><br><span class="line">		// 创建处理I/O操作的多线程事件循环器</span><br><span class="line">		// 接收进来的连接</span><br><span class="line">		EventLoopGroup bossGroup = new NioEventLoopGroup();</span><br><span class="line">		// 处理已经被接收的连接</span><br><span class="line">		EventLoopGroup workerGroup = new NioEventLoopGroup();</span><br><span class="line">		try &#123;</span><br><span class="line">			// 启动NIO服务的辅助启动类</span><br><span class="line">			ServerBootstrap bootstrap = new ServerBootstrap();</span><br><span class="line">			bootstrap</span><br><span class="line">				// 设置组</span><br><span class="line">				.group(bossGroup, workerGroup)</span><br><span class="line">				// 设置管道</span><br><span class="line">				.channel(NioServerSocketChannel.class)</span><br><span class="line">				// 设置过滤</span><br><span class="line">				.childHandler(new ChannelInitializer&lt;SocketChannel&gt;() &#123;</span><br><span class="line"></span><br><span class="line">					@Override</span><br><span class="line">					protected void initChannel(SocketChannel ch) throws Exception &#123;</span><br><span class="line">						// 设置过滤</span><br><span class="line">						ch.pipeline().addLast(new DiscardServerHandler());</span><br><span class="line">					&#125;					</span><br><span class="line">				&#125;)</span><br><span class="line">				// 后台日志</span><br><span class="line">				.option(ChannelOption.SO_BACKLOG, 128)</span><br><span class="line">				// 保持存活</span><br><span class="line">				.childOption(ChannelOption.SO_KEEPALIVE, true);</span><br><span class="line">				</span><br><span class="line">				// 绑定端口并开启服务器</span><br><span class="line">				ChannelFuture future = bootstrap.bind(port).sync();</span><br><span class="line">				// 等待知道这个服务器关闭</span><br><span class="line">				future.channel().closeFuture().sync();</span><br><span class="line">		&#125; finally &#123;</span><br><span class="line">			// 关闭</span><br><span class="line">			workerGroup.shutdownGracefully();</span><br><span class="line">			bossGroup.shutdownGracefully();</span><br><span class="line">		&#125;		</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	public static void main(String[] args) throws Exception &#123;</span><br><span class="line">		int port = 8081;</span><br><span class="line">		new DiscardServer(port).run();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######3). 测试<br>在命令提示符窗口，使用<code>telnet localhost 8081</code>来进行数据的测试, 由于此处为忽略所有的消息，故控制台无打印数据产生。此时修改DiscardServerHandler为<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 忽略所有消息--继承ChannelHandlerAdapter</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class DiscardServerHandler extends ChannelInboundHandlerAdapter &#123;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception &#123;</span><br><span class="line">		// 忽略数据</span><br><span class="line">		ByteBuf in = (ByteBuf) msg;</span><br><span class="line">		try &#123;</span><br><span class="line">			System.out.println(in.toString(CharsetUtil.US_ASCII));</span><br><span class="line">		&#125; finally &#123;</span><br><span class="line">			ReferenceCountUtil.release(msg);</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception &#123;</span><br><span class="line">		// 打印错误信息</span><br><span class="line">		cause.printStackTrace();</span><br><span class="line">		// 关闭</span><br><span class="line">		ctx.close();</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>再次使用<code>telnet localhost 8081</code>测试时，控制台即可打印出数据。<br><img src="https://upload-images.jianshu.io/upload_images/3110861-2e4490ee13452c67.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图1.png"></p>
<p>####3. ECHO服务（响应式协议）</p>
<p>######1). 创建响应式Handler<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 返回客户端发回的消息</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class EchoServerHandler extends ChannelInboundHandlerAdapter&#123;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception &#123;</span><br><span class="line">		ctx.write(msg);</span><br><span class="line">		ctx.flush();</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception &#123;</span><br><span class="line">		// 打印错误信息</span><br><span class="line">		cause.printStackTrace();</span><br><span class="line">		// 关闭</span><br><span class="line">		ctx.close();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######2). 创建服务器<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 返回客户端消息的服务器</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class EchoServer &#123;</span><br><span class="line">	/**端口*/</span><br><span class="line">	private int port;</span><br><span class="line">	</span><br><span class="line">	public EchoServer(int port) &#123;</span><br><span class="line">		this.port = port;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	public void run() throws Exception&#123;</span><br><span class="line">		// 创建处理I/O操作的多线程事件循环器</span><br><span class="line">		// 接收进来的连接</span><br><span class="line">		EventLoopGroup bossGroup = new NioEventLoopGroup();</span><br><span class="line">		// 处理已经被接收的连接</span><br><span class="line">		EventLoopGroup workerGroup = new NioEventLoopGroup();</span><br><span class="line">		try &#123;</span><br><span class="line">			// 启动NIO服务的辅助启动类</span><br><span class="line">			ServerBootstrap bootstrap = new ServerBootstrap();</span><br><span class="line">			bootstrap</span><br><span class="line">				// 设置组</span><br><span class="line">				.group(bossGroup, workerGroup)</span><br><span class="line">				// 设置管道</span><br><span class="line">				.channel(NioServerSocketChannel.class)</span><br><span class="line">				// 设置过滤</span><br><span class="line">				.childHandler(new ChannelInitializer&lt;SocketChannel&gt;() &#123;</span><br><span class="line"></span><br><span class="line">					@Override</span><br><span class="line">					protected void initChannel(SocketChannel ch) throws Exception &#123;</span><br><span class="line">						// 设置过滤</span><br><span class="line">						ch.pipeline().addLast(new EchoServerHandler());</span><br><span class="line">					&#125;					</span><br><span class="line">				&#125;)</span><br><span class="line">				// 后台日志</span><br><span class="line">				.option(ChannelOption.SO_BACKLOG, 128)</span><br><span class="line">				// 保持存活</span><br><span class="line">				.childOption(ChannelOption.SO_KEEPALIVE, true);</span><br><span class="line">				</span><br><span class="line">				// 绑定端口并开启服务器</span><br><span class="line">				ChannelFuture future = bootstrap.bind(port).sync();</span><br><span class="line">				// 等待知道这个服务器关闭</span><br><span class="line">				future.channel().closeFuture().sync();</span><br><span class="line">		&#125; finally &#123;</span><br><span class="line">			// 关闭</span><br><span class="line">			workerGroup.shutdownGracefully();</span><br><span class="line">			bossGroup.shutdownGracefully();</span><br><span class="line">		&#125;		</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	public static void main(String[] args) throws Exception &#123;</span><br><span class="line">		int port = 8082;</span><br><span class="line">		new EchoServer(port).run();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######3). 测试<br>在命令提示符窗口输入<code>telnet localhost 8081</code>命令，将’  你好啊’复制进去点击回车</p>
<p><img src="https://upload-images.jianshu.io/upload_images/3110861-85d3a060241716a7.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图2.png"></p>
<p>####4. TIME服务(时间协议的服务)</p>
<p>######1). 创建TimeServerHandler<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">public class TimeServerHandler extends ChannelInboundHandlerAdapter&#123;</span><br><span class="line"></span><br><span class="line">	/**</span><br><span class="line">	 * 将会在连接被建立并且准备进行通信时被调用</span><br><span class="line">	 */</span><br><span class="line">	@Override</span><br><span class="line">	public void channelActive(ChannelHandlerContext ctx) throws Exception &#123;</span><br><span class="line">		// 申请4个字节</span><br><span class="line">		final ByteBuf time = ctx.alloc().buffer(4);</span><br><span class="line">		// 存入数据</span><br><span class="line">		time.writeInt((int)(System.currentTimeMillis() / 1000L + 2208988800L));</span><br><span class="line">		// 写入数据</span><br><span class="line">		final ChannelFuture f = ctx.writeAndFlush(time);</span><br><span class="line">		// 设置监听</span><br><span class="line">		f.addListener(new ChannelFutureListener() &#123;</span><br><span class="line">			</span><br><span class="line">			@Override</span><br><span class="line">			public void operationComplete(ChannelFuture future) throws Exception &#123;</span><br><span class="line">				assert f == future;</span><br><span class="line">				ctx.close();</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception &#123;</span><br><span class="line">		// 打印错误信息</span><br><span class="line">		cause.printStackTrace();</span><br><span class="line">		// 关闭</span><br><span class="line">		ctx.close();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######2). TimeServer<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 返回客户端消息的服务器</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class TimeServer &#123;</span><br><span class="line">	/**端口*/</span><br><span class="line">	private int port;</span><br><span class="line">	</span><br><span class="line">	public TimeServer(int port) &#123;</span><br><span class="line">		this.port = port;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	public void run() throws Exception&#123;</span><br><span class="line">		// 创建处理I/O操作的多线程事件循环器</span><br><span class="line">		// 接收进来的连接</span><br><span class="line">		EventLoopGroup bossGroup = new NioEventLoopGroup();</span><br><span class="line">		// 处理已经被接收的连接</span><br><span class="line">		EventLoopGroup workerGroup = new NioEventLoopGroup();</span><br><span class="line">		try &#123;</span><br><span class="line">			// 启动NIO服务的辅助启动类</span><br><span class="line">			ServerBootstrap bootstrap = new ServerBootstrap();</span><br><span class="line">			bootstrap</span><br><span class="line">				// 设置组</span><br><span class="line">				.group(bossGroup, workerGroup)</span><br><span class="line">				// 设置管道</span><br><span class="line">				.channel(NioServerSocketChannel.class)</span><br><span class="line">				// 设置过滤</span><br><span class="line">				.childHandler(new ChannelInitializer&lt;SocketChannel&gt;() &#123;</span><br><span class="line"></span><br><span class="line">					@Override</span><br><span class="line">					protected void initChannel(SocketChannel ch) throws Exception &#123;</span><br><span class="line">						// 设置过滤</span><br><span class="line">						ch.pipeline().addLast(new TimeServerHandler());</span><br><span class="line">					&#125;					</span><br><span class="line">				&#125;)</span><br><span class="line">				// 后台日志</span><br><span class="line">				.option(ChannelOption.SO_BACKLOG, 128)</span><br><span class="line">				// 保持存活</span><br><span class="line">				.childOption(ChannelOption.SO_KEEPALIVE, true);		</span><br><span class="line">				// 绑定端口并开启服务器</span><br><span class="line">				ChannelFuture future = bootstrap.bind(port).sync();</span><br><span class="line">				// 等待知道这个服务器关闭</span><br><span class="line">				future.channel().closeFuture().sync();</span><br><span class="line">		&#125; finally &#123;</span><br><span class="line">			// 关闭</span><br><span class="line">			workerGroup.shutdownGracefully();</span><br><span class="line">			bossGroup.shutdownGracefully();</span><br><span class="line">		&#125;		</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	public static void main(String[] args) throws Exception &#123;</span><br><span class="line">		int port = 8083;</span><br><span class="line">		new TimeServer(port).run();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######3). TimeClientHandler<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line">public class TimeClientHandler extends ChannelInboundHandlerAdapter&#123;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception &#123;</span><br><span class="line">		ByteBuf mBuf = (ByteBuf) msg;</span><br><span class="line">		try &#123;</span><br><span class="line">			long currentTimeMillis = (mBuf.readUnsignedInt() - 2208988800L) * 1000L;</span><br><span class="line">			System.out.println(new Date(currentTimeMillis));</span><br><span class="line">			ctx.close();</span><br><span class="line">		&#125; finally &#123;</span><br><span class="line">			mBuf.release();</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception &#123;</span><br><span class="line">		cause.printStackTrace();</span><br><span class="line">		ctx.close();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######4). TimeClient<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line">public class TimeClient &#123;</span><br><span class="line">	public static void main(String[] args) throws InterruptedException &#123;</span><br><span class="line">		String host = &quot;127.0.0.1&quot;;</span><br><span class="line">		int post = 8083;</span><br><span class="line">		EventLoopGroup workerGroup = new NioEventLoopGroup();</span><br><span class="line">		</span><br><span class="line">		try &#123;</span><br><span class="line">			Bootstrap bootstrap = new Bootstrap();</span><br><span class="line">			bootstrap</span><br><span class="line">				.group(workerGroup)</span><br><span class="line">				.channel(NioSocketChannel.class)</span><br><span class="line">				.option(ChannelOption.SO_KEEPALIVE, true)</span><br><span class="line">				.handler(new ChannelInitializer&lt;SocketChannel&gt;() &#123;</span><br><span class="line"></span><br><span class="line">					@Override</span><br><span class="line">					protected void initChannel(SocketChannel ch) throws Exception &#123;</span><br><span class="line">						ch.pipeline().addLast(new TimeClientHandler());</span><br><span class="line">					&#125;</span><br><span class="line">				&#125;);</span><br><span class="line">			// 开启客户端</span><br><span class="line">			ChannelFuture future = bootstrap.connect(host, post).sync();</span><br><span class="line">			</span><br><span class="line">			// 等待直到连接关闭</span><br><span class="line">			future.channel().closeFuture().sync();</span><br><span class="line">		&#125; finally &#123;</span><br><span class="line">			workerGroup.shutdownGracefully();</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######5). 测试，首先运行TimeServer, 其次再运行TimeClient，查看控制台打印<br><img src="https://upload-images.jianshu.io/upload_images/3110861-edda5f517c238f6d.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图3.png"></p>
<p>####<a href="https://gitee.com/mazaiting/distributed" target="_blank" rel="noopener">代码下载</a></p>

      
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